Calculate the amount of energy available from a bottle (785 g) of rum. Assume it is 40% ethanol (C2H6O) by mass. Q for the combustion of ethanol is -1368 kJ/mole.

In this reaction n2o4(g)→2no2(g) what changes in color would you expect as pressure is increased at a constant temperature

Two friends at different locations want to communicate with each other by sending low energy signals. which of the following methods can they use to communicate? a) produce x-rays using colliding electrons and send them to radios, which capture sound b) send messages using infrared radiation, which travel in the form of waves c) send radio waves through intervening media like radio and television d) produce sound waves using microwaves from heated objects

Calculate the molar mass of aluminum oxide (al2o3). express your answer to four significant figures.